| Title: | Oxidation behaviour of microstructurally highly metastable Ag-La alloy |
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| Authors: | ID Jug, Andraž (Author)
ID Brunčko, Mihael (Author)
ID Rudolf, Rebeka (Author)
ID Anžel, Ivan (Author) |
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| Files: |  materials-15-02295.pdf (21,67 MB)
MD5: 0A3389C154717761A5EFA3BBF8849CCD
 https://www.mdpi.com/1996-1944/15/6/2295
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | A new silver-based alloy with 2 wt.% of lanthanum (La) was studied as a potential candidate
for electric contact material. The alloy was prepared by rapid solidification, performed by the melt
spinning technique. Microstructural examination of the rapidly solidified ribbons revealed very fine
grains of αAg and intermetallic Ag5La particles, which appear in the volume of the grains, as well as
on the grain boundaries. Rapid solidification enabled high microstructural refinement and provided
a suitable starting microstructure for the subsequent internal oxidation, resulting in fine submicronsized La2O3 oxide nanoparticle formation throughout the volume of the silver matrix (αAg). The
resulting nanostructured Ag-La2O3 microstructure was characterised by high-resolution FESEM
and STEM, both equipped with EDX. High-temperature internal oxidation of the rapidly solidified
ribbons essentially changed the microstructure. Mostly homogeneously dispersed nano-sized La2O3
were formed within the grains, as well as on the grain boundaries. Three mechanisms of internal
oxidation were identified: (i) the oxidation of La from the solid solution; (ii) partial dissolution of
finer Ag5La particles before the internal oxidation front and oxidation of La from the solid solution;
and (iii) direct oxidation of coarser Ag5La intermetallic particles. |
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| Keywords: | Ag-La alloy, rapid solidification, metastable microstructure, internal oxidation, characterisation, formation mechanism |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 10.02.2022 |
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| Article acceptance date: | 16.03.2022 |
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| Publication date: | 20.03.2022 |
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| Publisher: | MDPI AG |
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| Year of publishing: | 2022 |
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| Number of pages: | 18 str. |
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| Numbering: | Vol. 15, iss. 6 (2295) |
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| PID: | 20.500.12556/DKUM-92198  |
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| UDC: | 669.2/.8:620.18 |
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| ISSN on article: | 1996-1944 |
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| COBISS.SI-ID: | 101707267 |
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| DOI: | 10.3390/ma15062295 |
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| Copyright: | © 2022 by the authors. |
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| Publication date in DKUM: | 20.03.2025 |
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| Views: | 159 |
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| Downloads: | 11 |
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| Metadata: |    |
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| Categories: | Misc.
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